src.java.com.ctc.wstx.dtd.NameKey Maven / Gradle / Ivy
/* Woodstox XML processor
*
* Copyright (c) 2004 Tatu Saloranta, [email protected]
*
* Licensed under the License specified in file LICENSE, included with
* the source code.
* You may not use this file except in compliance with the License.
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.ctc.wstx.dtd;
import javax.xml.XMLConstants;
/**
* Simple key Object to be used for storing/accessing of potentially namespace
* scoped element and attribute names.
*
* One important note about usage is that two of the name components (prefix
* and local name) HAVE to have been interned some way, as all comparisons
* are done using identity comparison; whereas URI is NOT necessarily
* interned.
*
* Note that the main reason this class is mutable -- unlike most key classes
* -- is that this allows reusing key objects for access, as long as the code
* using it knows ramifications of trying to modify a key that's used
* in a data structure.
*
* Note, too, that the hash code is cached as this class is mostly used as
* a Map key, and hash code is used a lot.
*/
public final class NameKey
implements Comparable // to allow alphabetic ordering
{
private String mPrefix, mLocalName;
volatile int mHash = 0;
/*
///////////////////////////////////////////////////
// Life-cycle
///////////////////////////////////////////////////
*/
public NameKey(String prefix, String localName)
{
mLocalName = localName;
mPrefix = (prefix != null && prefix.length() == 0) ?
null : prefix;
}
public NameKey reset(String prefix, String localName)
{
mLocalName = localName;
mPrefix = (prefix != null && prefix.length() == 0) ?
null : prefix;
mHash = 0;
return this;
}
/*
///////////////////////////////////////////////////
// Accessors:
///////////////////////////////////////////////////
*/
public String getPrefix() { return mPrefix; }
public String getLocalName() { return mLocalName; }
/**
* @return True, if this attribute name would result in a namespace
* binding (ie. it's "xmlns" or starts with "xmlns:").
*/
public boolean isaNsDeclaration()
{
if (mPrefix == null) {
return mLocalName == "xmlns";
}
return mPrefix == "xmlns";
}
/**
* Method used to check for xml reserved attribute names, like
* "xml:space" and "xml:id".
*
* Note: it is assumed that the passed-in localName is also
* interned.
*/
boolean isXmlReservedAttr(boolean nsAware, String localName)
{
if (nsAware) {
if ("xml" == mPrefix) {
return mLocalName == localName;
}
} else {
if (mLocalName.length() == (4 + localName.length())) {
return (mLocalName.startsWith("xml:")
&& mLocalName.endsWith(localName));
}
}
return false;
}
/*
///////////////////////////////////////////////////
// Overridden standard methods:
///////////////////////////////////////////////////
*/
public String toString()
{
if (mPrefix == null || mPrefix.length() == 0) {
return mLocalName;
}
StringBuffer sb = new StringBuffer(mPrefix.length() + 1 + mLocalName.length());
sb.append(mPrefix);
sb.append(':');
sb.append(mLocalName);
return sb.toString();
}
public boolean equals(Object o)
{
if (o == this) {
return true;
}
if (!(o instanceof NameKey)) { // also filters out nulls
return false;
}
NameKey other = (NameKey) o;
if (mLocalName != other.mLocalName) { // assumes equality
return false;
}
return (mPrefix == other.mPrefix);
}
public int hashCode() {
int hash = mHash;
if (hash == 0) {
hash = mLocalName.hashCode();
if (mPrefix != null) {
hash ^= mPrefix.hashCode();
}
mHash = hash;
}
return hash;
}
public int compareTo(Object o)
{
NameKey other = (NameKey) o;
// First, by prefix, then by local name:
String op = other.mPrefix;
// Missing prefix is ordered before existing prefix
if (op == null || op.length() == 0) {
if (mPrefix != null && mPrefix.length() > 0) {
return 1;
}
} else if (mPrefix == null || mPrefix.length() == 0) {
return -1;
} else {
int result = mPrefix.compareTo(op);
if (result != 0) {
return result;
}
}
return mLocalName.compareTo(other.mLocalName);
}
}